I am in the process of rebuilding my motor. I got the main engine block assembled (w/o cylinder, piston, or carb). When I turn the crank by hand it feels really tight - like there is too much pressure on each side of it. Could it be the engine case bolts are too tight? I torqued the engine bolts to 5 ft/lbs, is this right? Or is the crank supposed to feel tight? Any help at all will be much appreciated.